Surprisingly there is no simple switch to flick on your iOS device or Mac that auto-adds holidays to the Calendar app. That however doesn’t mean that there isn’t a free and simple solution.
I couple of years ago I actually spent money on an app from the App Store to import calendars to my Calendar app. Granted it was only $0.99, but still, I could be $0.99 richer right now. That being said, I’ve decided to pass on this little tip to all of you, not only to save you a bit of spare change but because a Calendar just isn’t complete until you add the Holidays to it.